On Wed, 1 Feb 2012 11:03:19 -0800 Chris Albertson <[email protected]> wrote:
> On Wed, Feb 1, 2012 at 10:18 AM, Attila Kinali <[email protected]> wrote: > > > That said. I've contacted u-blox, but got a number that is way out of > > what i've expected (approx 120CHF). I'm currently trying to get a lower > > price. > > What is it these u-blox device can do that a cheaper Motorola Oncore > can't? Depending on the version the Oncore has for 50 to 5 nS > one-sigma error on the timing pulses and can do either 1PPS or 100PPS. > Single unit prices are from $18 to $60 very good documentation is > available. The Timing Appnote [1] says, that the 1PPS error's sigma is 6.7ns, before sawtooth correction and 3.0ns after. > If the u-blox was somehow much better than a Trimble thunderbolt or I dont have the numbers, but I doubt that a LEA-6T can beat a thunderbolt. > Motorola Oncore MT12T I'd buy one even at the above price. But > really these older GPSs are already at the single digtit of > nanoseconds level and I don't see room for improvement except.... > > If the L2 band is also used. This is the way to get order of > magnitude improments They are not dual band receivers. Yes, that would be really an improvement.. But i'm not convincing you to buy a LEA-6T. Nor do i think that it's a must have for anyone. Heck, you can get a complete thunderbolt with supply and antenna for 200USD on ebay. No LEA-6T based system will ever get that cheap. But there is not much way to tinker with a thunderbolt. You cannot play with its design. If you build a system from scratch, you can. Attila Kinali [1] https://www.u-blox.com/images/downloads/Product_Docs/Timing_AppNote_%28GPS.G6-X-11007%29.pdf -- Why does it take years to find the answers to the questions one should have asked long ago? _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
